在 JS/jQuery 中绑定箭头键 [英] Binding arrow keys in JS/jQuery

问题描述

如何将函数绑定到 Javascript 和/或 jQuery 中的左右箭头键?我查看了 jQuery 的 js-hotkey 插件(包装了内置的绑定函数以添加一个参数来识别特定的键)，但它似乎不支持箭头键.

How do I go about binding a function to left and right arrow keys in Javascript and/or jQuery? I looked at the js-hotkey plugin for jQuery (wraps the built-in bind function to add an argument to recognize specific keys), but it doesn't seem to support arrow keys.

推荐答案

document.onkeydown = function(e) {
    switch(e.which) {
        case 37: // left
        break;

        case 38: // up
        break;

        case 39: // right
        break;

        case 40: // down
        break;

        default: return; // exit this handler for other keys
    }
    e.preventDefault(); // prevent the default action (scroll / move caret)
};

如果需要支持IE8，函数体开头为e = e ||窗口事件；switch(e.which || e.keyCode) {.

If you need to support IE8, start the function body as e = e || window.event; switch(e.which || e.keyCode) {.

(2020 年编辑)
请注意，KeyboardEvent.which 现在已弃用.请参阅此示例使用KeyboardEvent.key 用于检测箭头键的更现代的解决方案.

(edit 2020)
Note that KeyboardEvent.which is now deprecated. See this example using KeyboardEvent.key for a more modern solution to detect arrow keys.

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